1 | // -----------------------------------------------------------------------
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2 | // <copyright file="UserActivityMeter.cs" company="Microsoft">
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3 | // Copyright (c) Microsoft Corporation. All rights reserved.
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4 | // </copyright>
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5 | // -----------------------------------------------------------------------
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6 |
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7 | namespace Microsoft.Samples.Kinect.Webserver.Sensor
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8 | {
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9 | using System.Collections.Generic;
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10 | using Microsoft.Kinect;
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11 |
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12 | /// <summary>
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13 | /// Helper class used to measure user activity.
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14 | /// </summary>
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15 | internal class UserActivityMeter
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16 | {
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17 | private readonly Dictionary<int, UserActivityRecord> activityRecords = new Dictionary<int, UserActivityRecord>();
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18 | private int totalUpdatesSoFar;
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19 |
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20 | /// <summary>
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21 | /// Clears all user activity metrics.
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22 | /// </summary>
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23 | public void Clear()
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24 | {
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25 | this.activityRecords.Clear();
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26 | }
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27 |
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28 | /// <summary>
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29 | /// Update user activity metrics with data from a collection of skeletons.
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30 | /// </summary>
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31 | /// <param name="skeletons">
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32 | /// Collection of skeletons to use to update activity metrics.
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33 | /// </param>
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34 | /// <param name="timestamp">
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35 | /// Time when skeleton array was received for processing.
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36 | /// </param>
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37 | /// <remarks>
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38 | /// UserActivityMeter assumes that this method is called regularly, e.g.: once
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39 | /// per skeleton frame received by application, so if a user whose activity was
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40 | /// previously measured is now absent, activity record will be removed.
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41 | /// </remarks>
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42 | public void Update(ICollection<Skeleton> skeletons, long timestamp)
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43 | {
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44 | foreach (var skeleton in skeletons)
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45 | {
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46 | UserActivityRecord record;
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47 |
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48 | if (this.activityRecords.TryGetValue(skeleton.TrackingId, out record))
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49 | {
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50 | record.Update(skeleton.Position, this.totalUpdatesSoFar, timestamp);
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51 | }
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52 | else
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53 | {
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54 | record = new UserActivityRecord(skeleton.Position, this.totalUpdatesSoFar, timestamp);
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55 | this.activityRecords[skeleton.TrackingId] = record;
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56 | }
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57 | }
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58 |
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59 | // Remove activity records corresponding to users that are no longer being tracked
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60 | var idsToRemove = new List<int>();
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61 | foreach (var record in this.activityRecords)
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62 | {
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63 | if (record.Value.LastUpdateId != this.totalUpdatesSoFar)
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64 | {
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65 | idsToRemove.Add(record.Key);
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66 | }
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67 | }
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68 |
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69 | foreach (var id in idsToRemove)
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70 | {
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71 | this.activityRecords.Remove(id);
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72 | }
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73 |
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74 | ++this.totalUpdatesSoFar;
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75 | }
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76 |
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77 | /// <summary>
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78 | /// Gets the activity record associated with the specified user.
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79 | /// </summary>
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80 | /// <param name="userTrackingId">
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81 | /// Skeleton tracking Id of user associated with the activity record to
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82 | /// retrieve.
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83 | /// </param>
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84 | /// <param name="record">
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85 | /// [out] When this method returns, contains the record associated with the
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86 | /// specified user tracking Id, if the appropriate activity record is found.
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87 | /// This parameter is passed uninitialized.
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88 | /// </param>
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89 | /// <returns>
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90 | /// <code>true</code> if the UserActivityMeter contains an activity record
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91 | /// for the specified user tracking Id; otherwise, <code>false</code>.
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92 | /// </returns>
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93 | public bool TryGetActivityRecord(int userTrackingId, out UserActivityRecord record)
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94 | {
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95 | return this.activityRecords.TryGetValue(userTrackingId, out record);
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96 | }
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97 | }
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98 | }
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